Need to Rename 1000's of Files Automatically in Linux

I tranferred thousands of files from one of my servers to the other via wget.

The orginal files were in the format [3234]screenshot.jpg

But now in the new server they are %5B3234%5Dscreenshot.jpg

The [ is replaced by %5B and the ] by %5D

Is there a command to automatically replace those %5B's and D's with the correct [ and ]

Cheers, Matt.

 

 

 

 

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